Method for controlling arc furnace

Abstract

A method for controlling an arc furnace is disclosed. In first step, many V-curved correlations between a value of arc current and a specific electric power consumption are obtained with respect to each of a plurality of measuring melting materials of various different scrap blendings. Next, in factory operation of the arc furnace, a melting material is melt at an arc current value in the bottom of the curve or in the vicinity of the bottom where the specific electric power consumption is minimal in the pre-obtained V-curve correlation with respect to the measuring melting material of scrap blending corresponding to scrap blending of the melting material to be melted.

What is claimed is: 
     
       1. A method for controlling an arc furnace including the steps of: charging a raw material to be melted into the arc furnace below an arc electrode disposed in the furnace;   determining an optimum arc current value to be supplied to said arc electrode; and   melting the raw material charged in said arc furnace by means of an arc generated between said charged raw material and said arc electrode by supplying said determined value of arc current to said arc electrode, said step of determining the optimum arc current value being characterized by the step of selecting an arc current value pre-obtained with respect to a raw material of the same bulk density as that of the raw material charged into the arc furnace, from a plurality of arc current values which are individually pre-obtained with respet to a plurality kinds of raw materials to be melted having respectively different bulk densities, said individual arc current values being current values at which each of the raw materials of various bulk densities is able to be melted in the state wherein the specific electric energy consumption is minimal.